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How SpringBoot uses Schedule to implement scheduled tasks

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May 27, 2023 pm 08:49 PM

schedulespringboot

0. Development environment

IDE: IntelliJ IDEA 2017.1 x64

jdk: 1.8.0_91

Spring Boot ：2.1.1.RELEASE

1. Simple scheduled tasks

For some relatively simple scheduled tasks, such as executing a fixed method at a fixed time interval, just annotate @Scheduled on the standard Java method

package cn.wbnull.springbootdemo.schedule;

import cn.wbnull.springbootdemo.util.DateUtils;
import cn.wbnull.springbootdemo.util.LoggerUtils;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
public class ScheduledTask {

    @Scheduled(cron = "0/10 * * * * ?") //每10秒执行一次
    public void scheduledTaskByCorn() {
        LoggerUtils.info("定时任务开始 ByCorn：" + DateUtils.dateFormat());
        scheduledTask();
        LoggerUtils.info("定时任务结束 ByCorn：" + DateUtils.dateFormat());
    }

    @Scheduled(fixedRate = 10000) //每10秒执行一次
    public void scheduledTaskByFixedRate() {
        LoggerUtils.info("定时任务开始 ByFixedRate：" + DateUtils.dateFormat());
        scheduledTask();
        LoggerUtils.info("定时任务结束 ByFixedRate：" + DateUtils.dateFormat());
    }

    @Scheduled(fixedDelay = 10000) //每10秒执行一次
    public void scheduledTaskByFixedDelay() {
        LoggerUtils.info("定时任务开始 ByFixedDelay：" + DateUtils.dateFormat());
        scheduledTask();
        LoggerUtils.info("定时任务结束 ByFixedDelay：" + DateUtils.dateFormat());
    }

    private void scheduledTask() {
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

Then add the annotation @EnableScheduling to the project startup class to indicate that scheduled tasks are enabled

package cn.wbnull.springbootdemo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;

@SpringBootApplication
@EnableScheduling
public class SpringBootDemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootDemoApplication.class, args);
    }
}

Here because we have created three scheduled tasks in the ScheduledTask class, @Scheduled does not execute concurrently by default, so Let’s comment out the others first and test them separately.

1.1 @Scheduled(cron = “0/10 * * * * ?”)

package cn.wbnull.springbootdemo.schedule;

import cn.wbnull.springbootdemo.util.DateUtils;
import cn.wbnull.springbootdemo.util.LoggerUtils;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
public class ScheduledTask {

    @Scheduled(cron = "0/10 * * * * ?") //每10秒执行一次
    public void scheduledTaskByCorn() {
        LoggerUtils.info("定时任务开始 ByCorn：" + DateUtils.dateFormat());
        scheduledTask();
        LoggerUtils.info("定时任务结束 ByCorn：" + DateUtils.dateFormat());
    }

    private void scheduledTask() {
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

Start the project, the running results are as follows

[INFO][2019 -02-18 16:08:40,095]||The scheduled task starts ByCorn: 2019-02-18 16:08:40
[INFO][2019-02-18 16:08:45,097]||The scheduled task ends ByCorn：2019-02-18 16:08:45
[INFO][2019-02-18 16:08:50,001]||Scheduled task startsByCorn：2019-02-18 16:08:50
[INFO][2019-02-18 16:08:55,003]||Timed task ended ByCorn: 2019-02-18 16:08:55
[INFO][2019-02-18 16:09:00,002] ||The scheduled task started ByCorn: 2019-02-18 16:09:00
[INFO][2019-02-18 16:09:05,004]||The scheduled task ended ByCorn: 2019-02-18 16:09 :05
[INFO][2019-02-18 16:09:10,001]||Scheduled task starts ByCorn: 2019-02-18 16:09:10
[INFO][2019-02-18 16 :09:15,003]||The scheduled task ends ByCorn: 2019-02-18 16:09:15
[INFO][2019-02-18 16:09:20,001]||The scheduled task starts ByCorn: 2019-02 -18 16:09:20
[INFO][2019-02-18 16:09:25,002]||Timed task ends ByCorn: 2019-02-18 16:09:25
[INFO][2019 -02-18 16:09:30,001]||The scheduled task starts ByCorn: 2019-02-18 16:09:30
[INFO][2019-02-18 16:09:35,002]||The scheduled task ends ByCorn: 2019-02-18 16:09:35

Let’s change the thread sleep time in the scheduledTask method so that the sleep time is greater than the scheduled task interval Thread.sleep(12000);, and then start project and view the running results.

[INFO][2019-02-18 16:14:20,080]||Scheduled task started ByCorn: 2019-02-18 16:14:20
[INFO][2019- 02-18 16:14:32,081]||The scheduled task ends ByCorn: 2019-02-18 16:14:32
[INFO][2019-02-18 16:14:40,001]||The scheduled task starts ByCorn ：2019-02-18 16:14:40
[INFO][2019-02-18 16:14:52,002]||Timed task endsByCorn：2019-02-18 16:14:52
[ INFO][2019-02-18 16:15:00,000]||Scheduled task started ByCorn: 2019-02-18 16:15:00
[INFO][2019-02-18 16:15:12,002]| | Scheduled task ends ByCorn: 2019-02-18 16:15:12

We can see that for cron expressions, if the business code execution time is less than the scheduled task interval, then the scheduled task The task is executed every 10 seconds and is not affected by the business code. No matter how long the business code is executed, the scheduled task is executed once every 10 seconds;

If the business code execution time is greater than the scheduled task interval, the scheduled task defaults to There is no concurrency, so until the 10 seconds after the execution of the business code is completed, the scheduled task is executed every 10 seconds and is not affected by the business code.

Note: The scheduled task controlled by @Scheduled(cron = "0/10 * * * * ?") is executed every 10 seconds, that is, within one minute, if the current If the number of seconds can be divided evenly by 10, then the scheduled task will be executed, or it can be understood as starting from 0 seconds every minute, executing the next time after 10 seconds, and starting from 0 seconds after one minute of execution. That is, it will only be executed at 10s, 20s, 30s... If you configure a scheduled task @Scheduled(cron = "0/7 * * * * ?"), it will only be executed at 0s, 7s, 14s... .

1.2 @Scheduled(fixedRate = 10000)

package cn.wbnull.springbootdemo.schedule;

import cn.wbnull.springbootdemo.util.DateUtils;
import cn.wbnull.springbootdemo.util.LoggerUtils;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
public class ScheduledTask {

    @Scheduled(fixedRate = 10000) //每10秒执行一次
    public void scheduledTaskByFixedRate() {
        LoggerUtils.info("定时任务开始 ByFixedRate：" + DateUtils.dateFormat());
        scheduledTask();
        LoggerUtils.info("定时任务结束 ByFixedRate：" + DateUtils.dateFormat());
    }

    private void scheduledTask() {
        try {
            Thread.sleep(12000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

Start the project and the running results are as follows

[INFO][2019-02-18 17:33:18,235 ]||The scheduled task started ByFixedRate: 2019-02-18 17:33:18
[INFO][2019-02-18 17:33:23,239]||The scheduled task ended ByFixedRate: 2019-02-18 17: 33:23
[INFO][2019-02-18 17:33:28,191]||Scheduled task starts ByFixedRate: 2019-02-18 17:33:28
[INFO][2019-02-18 17:33:33,195]||The scheduled task ends ByFixedRate: 2019-02-18 17:33:33
[INFO][2019-02-18 17:33:38,189]||The scheduled task starts ByFixedRate: 2019- 02-18 17:33:38
[INFO][2019-02-18 17:33:43,191]||Timed task endsByFixedRate: 2019-02-18 17:33:43
[INFO][ 2019-02-18 17:33:48,184]|| Scheduled task starts ByFixedRate: 2019-02-18 17:33:48
[INFO][2019-02-18 17:33:53,186]|| Scheduled task EndByFixedRate: 2019-02-18 17:33:53
[INFO][2019-02-18 17:33:58,190]||Timed task startsByFixedRate: 2019-02-18 17:33:58
[INFO][2019-02-18 17:34:03,193]||Scheduled task ends ByFixedRate: 2019-02-18 17:34:03

Let’s change the thread in the scheduledTask method Set the sleep time to be greater than the scheduled task interval Thread.sleep(12000);, then start the project and check the running results.

[INFO][2019-02-18 17:31:30,122]||定时任务开始 ByFixedRate：2019-02-18 17:31:30
[INFO][2019-02-18 17:31:42,122]||定时任务结束 ByFixedRate：2019-02-18 17:31:42
[INFO][2019-02-18 17:31:42,123]||定时任务开始 ByFixedRate：2019-02-18 17:31:42
[INFO][2019-02-18 17:31:54,123]||定时任务结束 ByFixedRate：2019-02-18 17:31:54
[INFO][2019-02-18 17:31:54,124]||定时任务开始 ByFixedRate：2019-02-18 17:31:54
[INFO][2019-02-18 17:32:06,127]||定时任务结束 ByFixedRate：2019-02-18 17:32:06
[INFO][2019-02-18 17:32:06,127]||定时任务开始 ByFixedRate：2019-02-18 17:32:06
[INFO][2019-02-18 17:32:18,134]||定时任务结束 ByFixedRate：2019-02-18 17:32:18

对于fixedRate 来说，如果业务代码执行时间小于定时任务间隔时间，那么定时任务每10秒执行一次，且不受业务代码影响，无论业务代码执行多久，定时任务都是10秒执行一次；

如果业务代码执行时间大于定时任务间隔时间，则定时任务循环执行。

1.3 @Scheduled(fixedDelay = 10000)

package cn.wbnull.springbootdemo.schedule;

import cn.wbnull.springbootdemo.util.DateUtils;
import cn.wbnull.springbootdemo.util.LoggerUtils;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
public class ScheduledTask {

    @Scheduled(fixedDelay = 10000) //每10秒执行一次
    public void scheduledTaskByFixedDelay() {
        LoggerUtils.info("定时任务开始 ByFixedDelay：" + DateUtils.dateFormat());
        scheduledTask();
        LoggerUtils.info("定时任务结束 ByFixedDelay：" + DateUtils.dateFormat());
    }

    private void scheduledTask() {
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

启动项目，运行结果如下

[INFO][2019-02-18 17:45:30,784]||定时任务开始 ByFixedDelay：2019-02-18 17:45:30
[INFO][2019-02-18 17:45:35,792]||定时任务结束 ByFixedDelay：2019-02-18 17:45:35
[INFO][2019-02-18 17:45:45,803]||定时任务开始 ByFixedDelay：2019-02-18 17:45:45
[INFO][2019-02-18 17:45:50,812]||定时任务结束 ByFixedDelay：2019-02-18 17:45:50
[INFO][2019-02-18 17:46:00,814]||定时任务开始 ByFixedDelay：2019-02-18 17:46:00
[INFO][2019-02-18 17:46:05,817]||定时任务结束 ByFixedDelay：2019-02-18 17:46:05
[INFO][2019-02-18 17:46:15,821]||定时任务开始 ByFixedDelay：2019-02-18 17:46:15
[INFO][2019-02-18 17:46:20,825]||定时任务结束 ByFixedDelay：2019-02-18 17:46:20
[INFO][2019-02-18 17:46:30,829]||定时任务开始 ByFixedDelay：2019-02-18 17:46:30
[INFO][2019-02-18 17:46:35,834]||定时任务结束 ByFixedDelay：2019-02-18 17:46:35

我们再改下scheduledTask方法中线程休眠时间，使休眠时间大于定时任务间隔时间Thread.sleep(12000);，然后启动项目，查看运行结果。

[INFO][2019-02-18 17:47:06,871]||定时任务开始 ByFixedDelay：2019-02-18 17:47:06
[INFO][2019-02-18 17:47:18,879]||定时任务结束 ByFixedDelay：2019-02-18 17:47:18
[INFO][2019-02-18 17:47:28,890]||定时任务开始 ByFixedDelay：2019-02-18 17:47:28
[INFO][2019-02-18 17:47:40,896]||定时任务结束 ByFixedDelay：2019-02-18 17:47:40
[INFO][2019-02-18 17:47:50,903]||定时任务开始 ByFixedDelay：2019-02-18 17:47:50
[INFO][2019-02-18 17:48:02,911]||定时任务结束 ByFixedDelay：2019-02-18 17:48:02
[INFO][2019-02-18 17:48:12,917]||定时任务开始 ByFixedDelay：2019-02-18 17:48:12
[INFO][2019-02-18 17:48:24,924]||定时任务结束 ByFixedDelay：2019-02-18 17:48:24

对于fixedDelay 来说，不管业务代码执行时间与定时任务间隔时间熟长熟短，定时任务都会等业务代码执行完成后再开启新一轮定时。

不过，一般大家在使用定时任务时，都是定时任务时间间隔大于业务代码执行时间。

1.4 多说一点

对于固定时间执行的定时任务，比如每天凌晨4点执行，只能使用cron表达式的方式

2. corn表达式

2.1 corn表达式格式

corn表达式格式：秒分时日月星期年（可选）

字段名	允许的值	允许的特殊字符
秒	0-59	, - * /
分	0-59	, - * /
时	0-23	, - * /
日	1-31	, - * ? / L W C
月	1-12 或 JAN-DEC	, - * /
星期	1-7 或 SUN-SAT	, - * ? / L C #
年（可选）	空或 1970-2099	, - * /

释义：

1、*：通配符，表示该字段可以接收任意值。

2、？：表示不确定的值，或不关心它为何值，仅在日期和星期中使用，当其中一个设置了条件时，另外一个用"?" 来表示"任何值"。

3、,：表示多个值，附加一个生效的值。

4、-：表示一个指定的范围

5、/：指定一个值的增量值。例n/m表示从n开始，每次增加m

6、L：用在日期表示当月的最后一天，用在星期"L"单独使用时就等于"7"或"SAT"，如果和数字联合使用表示该月最后一个星期X。例如，"0L"表示该月最后一个星期日。

7、W：指定离给定日期最近的工作日（周一到周五），可以用"LW"表示该月最后一个工作日。例如，"10W"表示这个月离10号最近的工作日

8、C：表示和calendar联系后计算过的值。例如：用在日期中，"5C"表示该月第5天或之后包括calendar的第一天；用在星期中，"5C"表示这周四或之后包括calendar的第一天。

9、#：表示该月第几个星期X。例6#3表示该月第三个周五。

2.2 示例值

0 * * * * ? 每分钟触发

0 0 * * * ? 每小时整触发

0 0 4 * * ? 每天凌晨4点触发

0 15 10 * * ? 每天早上10：15触发

*/5 * * * * ? 每隔5秒触发

0 */5 * * * ? 每隔5分钟触发

0 0 4 1 * ? 每月1号凌晨4点触发

0 0 4 L * ? 每月最后一天凌晨3点触发

0 0 3 ? * L 每周星期六凌晨3点触发

0 11,22,33 * * * ? 每小时11分、22分、33分触发

3. 配置定时任务

对于上面那些简单的定时任务，定时任务的corn表达式写死在代码里，如果要改动表达式，需要修改代码，重新打包发布，比较麻烦。因此，我们可以把corn表达式配置在配置文件中，然后程序读取配置，当需要修改表达式时，只需要修改配置文件即可。

application.yml增加配置

demo:
  corn: 0/11 * * * * ?

定时任务

package cn.wbnull.springbootdemo.schedule;

import cn.wbnull.springbootdemo.util.DateUtils;
import cn.wbnull.springbootdemo.util.LoggerUtils;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
public class ScheduledTask {

    @Scheduled(cron = "${demo.corn}")
    public void scheduledTaskByConfig() {
        LoggerUtils.info("定时任务 ByConfig：" + DateUtils.dateFormat());
    }
}

启动项目，运行结果如下

[INFO][2019-02-18 23:47:33,047]||定时任务 ByConfig：2019-02-18 23:47:33
[INFO][2019-02-18 23:47:44,003]||定时任务 ByConfig：2019-02-18 23:47:44
[INFO][2019-02-18 23:47:55,009]||定时任务 ByConfig：2019-02-18 23:47:55
[INFO][2019-02-18 23:48:00,008]||定时任务 ByConfig：2019-02-18 23:48:00
[INFO][2019-02-18 23:48:11,009]||定时任务 ByConfig：2019-02-18 23:48:11
[INFO][2019-02-18 23:48:22,009]||定时任务 ByConfig：2019-02-18 23:48:22
[INFO][2019-02-18 23:48:33,009]||定时任务 ByConfig：2019-02-18 23:48:33

修改application.yml配置

demo:
  corn: 0/23 * * * * ?

启动项目，运行结果如下

[INFO][2019-02-18 23:52:23,089]||定时任务 ByConfig：2019-02-18 23:52:23
[INFO][2019-02-18 23:52:46,008]||定时任务 ByConfig：2019-02-18 23:52:46
[INFO][2019-02-18 23:53:00,009]||定时任务 ByConfig：2019-02-18 23:53:00
[INFO][2019-02-18 23:53:23,002]||定时任务 ByConfig：2019-02-18 23:53:23
[INFO][2019-02-18 23:53:46,009]||定时任务 ByConfig：2019-02-18 23:53:46

定时任务根据配置文件动态变化。

4. 动态修改定时任务

对于有些情况，我们需要在代码中，通过方法动态修改定时任务corn表达式

application.yml配置

demo:
  corn: 0/7 * * * * ?
  cornV2: 0/22 * * * * ?

新建ScheduledTaskV2.java

package cn.wbnull.springbootdemo.schedule;

import cn.wbnull.springbootdemo.util.DateUtils;
import cn.wbnull.springbootdemo.util.LoggerUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.stereotype.Component;

@Component
public class ScheduledTaskV2 implements SchedulingConfigurer {

    @Value("${demo.corn}")
    private String corn;
    @Value("${demo.cornV2}")
    private String cornV2;

    private int tag = 0;

    @Override
    public void configureTasks(ScheduledTaskRegistrar scheduledTaskRegistrar) {
        scheduledTaskRegistrar.addTriggerTask(() -> {
            LoggerUtils.info("定时任务V2：" + DateUtils.dateFormat());
        }, (triggerContext) -> {
            CronTrigger cronTrigger;
            if (tag % 2 == 0) {
                LoggerUtils.info("定时任务V2动态修改corn表达式：" + corn + "," + DateUtils.dateFormat());
                cronTrigger = new CronTrigger(corn);
                tag++;
            } else {
                LoggerUtils.info("定时任务V2动态修改corn表达式：" + cornV2 + "," + DateUtils.dateFormat());
                cronTrigger = new CronTrigger(cornV2);
                tag++;
            }

            return cronTrigger.nextExecutionTime(triggerContext);
        });
    }
}

启动项目，运行结果如下

[INFO][2019-02-19 00:19:49,011]||定时任务V2：2019-02-19 00:19:49
[INFO][2019-02-19 00:19:49,011]||定时任务V2动态修改corn表达式：0/22 * * * * ?,2019-02-19 00:19:49
[INFO][2019-02-19 00:20:00,007]||定时任务V2：2019-02-19 00:20:00
[INFO][2019-02-19 00:20:00,007]||定时任务V2动态修改corn表达式：0/7 * * * * ?,2019-02-19 00:20:00
[INFO][2019-02-19 00:20:07,006]||定时任务V2：2019-02-19 00:20:07
[INFO][2019-02-19 00:20:07,006]||定时任务V2动态修改corn表达式：0/22 * * * * ?,2019-02-19 00:20:07
[INFO][2019-02-19 00:20:22,008]||定时任务V2：2019-02-19 00:20:22
[INFO][2019-02-19 00:20:22,008]||定时任务V2动态修改corn表达式：0/7 * * * * ?,2019-02-19 00:20:22
[INFO][2019-02-19 00:20:28,010]||定时任务V2：2019-02-19 00:20:28
[INFO][2019-02-19 00:20:28,010]||定时任务V2动态修改corn表达式：0/22 * * * * ?,2019-02-19 00:20:28
[INFO][2019-02-19 00:20:44,003]||定时任务V2：2019-02-19 00:20:44
[INFO][2019-02-19 00:20:44,003]||定时任务V2动态修改corn表达式：0/7 * * * * ?,2019-02-19 00:20:44
[INFO][2019-02-19 00:20:49,004]||定时任务V2：2019-02-19 00:20:49
[INFO][2019-02-19 00:20:49,004]||定时任务V2动态修改corn表达式：0/22 * * * * ?,2019-02-19 00:20:49
[INFO][2019-02-19 00:21:00,011]||定时任务V2：2019-02-19 00:21:00
[INFO][2019-02-19 00:21:00,011]||定时任务V2动态修改corn表达式：0/7 * * * * ?,2019-02-19 00:21:00
[INFO][2019-02-19 00:21:07,011]||定时任务V2：2019-02-19 00:21:07
[INFO][2019-02-19 00:21:07,011]||定时任务V2动态修改corn表达式：0/22 * * * * ?,2019-02-19 00:21:07

成功通过代码动态修改corn表达式且运行结果正确。

5. 并发执行定时任务

回到我们 1. 简单定时任务 中创建的三个定时任务，当时因为@Scheduled默认是不并发执行的，所以我们先注释掉了其他定时任务，分别进行的测试。

那我们实际开发中，确实创建了多个定时任务，且想并发执行时，该怎么做呢？

定时任务类添加注解@EnableAsync，需并发执行的定时任务方法添加注解@Async

新建定时任务类ScheduledTaskV3

package cn.wbnull.springbootdemo.schedule;

import cn.wbnull.springbootdemo.util.DateUtils;
import cn.wbnull.springbootdemo.util.LoggerUtils;
import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
@EnableAsync
public class ScheduledTaskV3 {

    @Scheduled(cron = "0/7 * * * * ?")
    @Async
    public void scheduledTaskV1() {
        LoggerUtils.info("定时任务V3，定时任务1开始：" + DateUtils.dateFormat());
        scheduledTask();
        LoggerUtils.info("定时任务V3，定时任务1结束：" + DateUtils.dateFormat());
    }

    @Scheduled(cron = "0/10 * * * * ?")
    @Async
    public void scheduledTaskV2() {
        LoggerUtils.info("定时任务V3，定时任务2开始：" + DateUtils.dateFormat());
        scheduledTask();
        LoggerUtils.info("定时任务V3，定时任务2结束：" + DateUtils.dateFormat());
    }

    @Scheduled(cron = "0/22 * * * * ?")
    @Async
    public void scheduledTaskV3() {
        LoggerUtils.info("定时任务V3，定时任务3开始：" + DateUtils.dateFormat());
        scheduledTask();
        LoggerUtils.info("定时任务V3，定时任务3结束：" + DateUtils.dateFormat());
    }

    private void scheduledTask() {
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

启动项目，运行结果如下

[INFO][2019-02-19 00:36:21,077]||定时任务V3，定时任务1开始：2019-02-19 00:36:21
[INFO][2019-02-19 00:36:22,003]||定时任务V3，定时任务3开始：2019-02-19 00:36:22
[INFO][2019-02-19 00:36:26,078]||定时任务V3，定时任务1结束：2019-02-19 00:36:26
[INFO][2019-02-19 00:36:27,006]||定时任务V3，定时任务3结束：2019-02-19 00:36:27
[INFO][2019-02-19 00:36:28,003]||定时任务V3，定时任务1开始：2019-02-19 00:36:28
[INFO][2019-02-19 00:36:30,003]||定时任务V3，定时任务2开始：2019-02-19 00:36:30
[INFO][2019-02-19 00:36:33,003]||定时任务V3，定时任务1结束：2019-02-19 00:36:33
[INFO][2019-02-19 00:36:35,004]||定时任务V3，定时任务1开始：2019-02-19 00:36:35
[INFO][2019-02-19 00:36:35,005]||定时任务V3，定时任务2结束：2019-02-19 00:36:35
[INFO][2019-02-19 00:36:40,003]||定时任务V3，定时任务2开始：2019-02-19 00:36:40
[INFO][2019-02-19 00:36:40,005]||定时任务V3，定时任务1结束：2019-02-19 00:36:40
[INFO][2019-02-19 00:36:42,001]||定时任务V3，定时任务1开始：2019-02-19 00:36:42
[INFO][2019-02-19 00:36:44,003]||定时任务V3，定时任务3开始：2019-02-19 00:36:44
[INFO][2019-02-19 00:36:45,004]||定时任务V3，定时任务2结束：2019-02-19 00:36:45
[INFO][2019-02-19 00:36:47,002]||定时任务V3，定时任务1结束：2019-02-19 00:36:47
[INFO][2019-02-19 00:36:49,002]||定时任务V3，定时任务1开始：2019-02-19 00:36:49
[INFO][2019-02-19 00:36:49,004]||定时任务V3，定时任务3结束：2019-02-19 00:36:49
[INFO][2019-02-19 00:36:50,001]||定时任务V3，定时任务2开始：2019-02-19 00:36:50

定时任务能够并发执行。

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